FOX ESS - KH10 hybrid inverter

Technical specifications of the Fox ESS KH10

The Fox ESS KH10 is the flagship single-phase hybrid inverter in the K Series, designed for high-power residential installations and multi-orientation configurations. It features four independent MPPTs, high-voltage battery storage, EPS backup, and natural cooling—all housed in an IP65-rated enclosure.

• Rated AC power: 10,500 VA (10.5 kVA) — single-phase 230 V, max. current 45.7 A

• 4 independent MPPTs — 1 string per tracker, max. current 16 A/MPPT, Isc 20 A, MPPT range 80–500 V

• Permissible PV power: 21 kWp (15,000 W DC max.), max. voltage 600 V — DC/AC ratio up to 2:1

• Maximum yield 97.8% — European yield 97.4%, MPPT 99.9%

• High voltage battery storage — Li-Ion 85–480 V, 50 A charge/discharge, compatible DHW and EQ6000 Plus

• EPS (Emergency Power Supply) — basculement < 10 ms, puissance de secours jusqu'à 18 kVA crête

• Integrated AFCI protection — DC arc flash detection, fire safety compliance

• Type II surge protector — integrated SPD2 on both DC and AC sides, no external module

• IP65, natural cooling — fanless outdoor installation, silent, -25 to +60 °C

• FoxCloud Monitoring — Wi-Fi included, LAN and 4G optional, monitoring via app or web portal

• Parallelization — up to 10 inverters in parallel on-grid, 2–7 off-grid

• Dimensions — 450 × 527 × 208 mm, 29 kg

• Manufacturer's warranty: 10 years (subject to registration within 30 days)

• Certifications — EN 50549-1 (France), IEC 62109-1/2

Four MPPTs: why this is a construction site advantage

Most single-phase hybrid inverters on the market offer only 2 MPPTs. The KH10 offers 4 , each driving an independent string. In practice, this changes the game in three common scenarios:

• Multi-sloped roofs — four different orientations or pitches without loss of efficiency due to mismatch, where a 2 MPPT inverter imposes configuration compromises

• Partial shading — each string operates at its own maximum power point; shaded panels on one string do not penalize the others

• Scalability — the ability to add modules later on a free MPPT, without rewiring the existing system

For an installer, 4 MPPTs on a 10 kW single-phase system offer the flexibility of a C&I inverter in a 29 kg residential enclosure.

Storage and EPS — the battery ecosystem Fox ESS

The KH10 manages storage via a high-voltage battery bus (85–480 V, max. current 50 A charge and discharge). It is compatible with the following battery ranges. Fox ESS following:

• EQ6000 Plus — 5.99 kWh stackable modules (1 BMS + up to 6 modules per stack, i.e. 35.9 kWh max.)

• ECS2900 / ECS4100 / ECS4800 — series DHW up to 7 modules in series (33.24 kWh max.)

• HV2600 — compact high voltage module

The EPS (Emergency Power Supply) function switches power from the grid to the battery in less than 10 ms — fast enough to avoid interrupting sensitive equipment (internet router, home automation, lighting). Peak power in backup mode reaches 18 kVA.

Professional application areas

High-power residential (6–21 kWp) The KH10 is sized for homes with large usable roof areas (> 40 m²) or complex multi-slope configurations. The 2:1 DC/AC ratio allows for PV oversizing to maximize winter self-consumption. The integrated EPS covers backup power needs without the need for an external ATS cabinet.

Energy renovation with storage : When retrofitted to an existing PV system, the KH10 replaces the existing string inverter and adds battery storage in a single operation. The CT included in the box allows for immediate commissioning without additional accessories.

Small single-phase commercial buildings: Offices, shops, and professional practices connected to a single-phase supply up to 18 kVA: the KH10 manages self-consumption with energy storage and backup power for critical circuits (cash register, server, alarm). Parallel connection of up to 10 units allows for power coverage far exceeding individual unit requirements.

Why order the Fox ESS KH10 at POwR Connect

POwR Connect is a B2B distributor specializing in photovoltaics and storage, exclusively reserved for professionals.

• Professional price excluding VAT — installer rates after free account creation, with discounts for larger quantities

• Fox ESS ecosystem consistency — inverters, EQ6000 Plus batteries, meters, accessories available in the same space, with a single order

• Stock France — fast delivery, no import delays

• Technical documentation — K Series datasheet, EN 50549-1 certificate, warranty extension procedure downloadable from the product page

• Installation support — direct link to the POwR support portal for Fox ESS installation and commissioning

• Technical support — sizing, battery compatibility, FoxCloud configuration: our team assists installers

FAQ — Hybrid inverter Fox ESS KH10

Is the KH10 single-phase or three-phase?
The KH10 is a single-phase inverter (230 V, 50 Hz). The K Series (KH7 to KH10.5) is exclusively single-phase. For three-phase power, Fox ESS offers the H3 series (H3-5.0-E to H3-12.0-E) or the P3 series for higher power outputs.

What is the difference between the Fox ESS KH10 and H1?
The KH10 (K Series) offers 4 MPPTs, a nominal power of 10.5 kVA, up to 21 kWp PV capacity, and parallelization of up to 10 units. The H1 (H1 Series) is limited to 2 MPPTs, a maximum power of 6 kW, and accepts up to 12 kWp PV. The KH10 is designed for high-power residential installations, while the H1 is for standard configurations ≤ 6 kWp.

Which batteries are compatible with the KH10?
All high-voltage batteries Fox ESS EQ6000 Plus (formerly EP), ECS2900, ECS4100, ECS4800, HV2600. The permissible battery voltage ranges from 85 to 480 V, with a maximum charge/discharge current of 50 A. Up to 33.24 kWh in this configuration. DHW , even more so with the EQ6000 Plus.

Does the EPS from the KH10 supply the entire house?
By default, the EPS powers a dedicated circuit (connected to the UPS's EPS output). For complete home backup power, an EPS Box-SP enclosure is required. Peak power in backup mode is 18 kVA, with a switchover time of less than 10 ms.

Is the CT included with the KH10?
Yes. The box includes the Wi-Fi dongle and a current transformer (CT). A second CT is required if another generator is present on the site (wind turbine, another PV inverter, generator set).

Is the KH10 certified for the French market?
Yes. The KH10 has EN 50549-1 certification for France, which can be downloaded as a document on the product page. POwR Connect .